Hello moleman,
That fluting machine seems to be an EDM since as you mentioned the little rod in the barrel chamber appears to be an electrode rather than a broaching device.

That electrode likely is mounted via insulation to the machine and a hot wire connects there to the elctrode. The ground wire would connect to the barrel.

As an engineering student I designed and built a small EDM machine a few decades ago. The EDM had an idiot simple "feedback circuit" that let the operator know when the electrode got welded accidentally to the work. That does happen even with the big buck machines. My heavy duty resistors were 200 watt lightbulbs. When the electrode welded and "grounded out" the bulbs (2 of them) would light up !! That signals it's time to back up and break contact. Fun stuff !!!

Good catch Viper Dude! I remember the original thread I saw was a home made broach and just figured back then that this one was the updated version since it had been a couple years since I saw the thread. I thought the broach looked too thin at the time and thought maybe it was just a mock up. I wasn't even thinking about an edm. I saw some home made edm plans on ebay a while back. Looks like the guy is still selling them 2 years later... EDM Machine Sinker Plans Build CD Broken Tap Extractor - eBay (item 160394607217 end time Feb-11-10 17:43:52 PST) Just figured it fell into the snake oil salesman catagory. Thanks for the information, I'd love to have 1/4 of the machining knowledge you have.

yep there are a suprising number of sources for new commerical 7.92x33mm kurtz. also easily formed from 8mm mauser or similar cases. Still there is no point in doing this for the FMJ round, its near identical to the 7.62x39mm russian; load up subsonics or 8mm soft points at least.

I was able to load 15 rounds into an 30 round AK mag- there was room for more but I only own 15 rounds of DDR 7.92x33mm. i imagine it would fit 26-27, but not sure the curvature will let that many rounds feed without binding.

Hello moleman,
The EDM you referenced looks strangely like mine from 30 years ago !!! Wow, time flies when you are building neet stuff !!! I started with an ancient EDM circuit from a 1950's Pop Sci mag and up-graded it from a half wave rectifier to a full wave (bridge diode type) to get about double the power output. It was a challenge as I am not an EE.

Hello nkluksda,
The EDM you referenced is a more involved machine that uses an automatic feed system with a feedback circuit like the big boys use. The EDM industry in the US once the largest in the world has vanished and moved to Europe (Germany and Switzerland). One of my college profs was a world-class authority on these "non-traditional manufacturing processes". I was always asking him EDM questions.

Even back then I realised that the EDM had small arms manufacturing potential as well as aerospace applications. However the process is VERY slow as it is a spark etching thing but it will carve even hard or exotic metals. A properly shaped tool-electrode can carve a wierd-shaped blind pocket (locking recess on a Soviet DP-28 for eg.). Those DP locking lug pockets were originally done with a special Metal Shaper machine shaping to a horizontal relief cut.

The EDM machine can do some very cool things in a small home shop that not even a CNC mill or lathe can do. Besides "etching" chamber flutes you could even etch small portraits in reverse on the side of your AK's from a tool made from a coin. Yes, an Abe Lincoln Commemorative AK from a penny !!! haha.

i just checked for fun and midway has an 8mm kurtz hornady die set for 69$ not bad for an uncommon round and as far as the chamber reamer i have no clue but i wonder if a 8mm mauser barrel could have part of the chamber section cut off and even if the shoulder of the 8 kurtz is not as shart couldn't you use valve lapping paste on a kurz case and i guess lap the chamber till it fits right?